<template>
  <div id="map" class="map" ref="rootmap"></div>
</template>

<script>
import 'ol/ol.css';
import Circle from 'ol/geom/Circle';
import Feature from 'ol/Feature';
import GeoJSON from 'ol/format/GeoJSON';
import Map from 'ol/Map';
import View from 'ol/View';
import { Circle as CircleStyle, Fill, Stroke, Style } from 'ol/style';
import { OSM, Vector as VectorSource } from 'ol/source';
import { Tile as TileLayer, Vector as VectorLayer } from 'ol/layer';

const image = new CircleStyle({
  radius: 5,
  fill: null,
  stroke: new Stroke({ color: 'red', width: 1 }),
});

const styles = {
  Point: new Style({
    image: image,
  }),
  LineString: new Style({
    stroke: new Stroke({
      color: 'green',
      width: 1,
    }),
  }),
  MultiLineString: new Style({
    stroke: new Stroke({
      color: 'green',
      width: 1,
    }),
  }),
  MultiPoint: new Style({
    image: image,
  }),
  MultiPolygon: new Style({
    stroke: new Stroke({
      color: 'yellow',
      width: 1,
    }),
    fill: new Fill({
      color: 'rgba(255, 255, 0, 0.1)',
    }),
  }),
  Polygon: new Style({
    stroke: new Stroke({
      color: 'blue',
      lineDash: [4],
      width: 3,
    }),
    fill: new Fill({
      color: 'rgba(0, 0, 255, 0.1)',
    }),
  }),
  GeometryCollection: new Style({
    stroke: new Stroke({
      color: 'magenta',
      width: 2,
    }),
    fill: new Fill({
      color: 'magenta',
    }),
    image: new CircleStyle({
      radius: 10,
      fill: null,
      stroke: new Stroke({
        color: 'magenta',
      }),
    }),
  }),
  Circle: new Style({
    stroke: new Stroke({
      color: 'red',
      width: 2,
    }),
    fill: new Fill({
      color: 'rgba(255,0,0,0.2)',
    }),
  }),
};

const styleFunction = function (feature) {
  return styles[feature.getGeometry().getType()];
};

const geojsonObject = {
  type: 'FeatureCollection',
  crs: {
    type: 'name',
    properties: {
      name: 'EPSG:3857',
    },
  },
  features: [
    {
      type: 'Feature',
      geometry: {
        type: 'Point',
        coordinates: [0, 0],
      },
    },
    {
      type: 'Feature',
      geometry: {
        type: 'LineString',
        coordinates: [
          [4e6, -2e6],
          [8e6, 2e6],
        ],
      },
    },
    {
      type: 'Feature',
      geometry: {
        type: 'LineString',
        coordinates: [
          [4e6, 2e6],
          [8e6, -2e6],
        ],
      },
    },
    {
      type: 'Feature',
      geometry: {
        type: 'Polygon',
        coordinates: [
          [
            [-5e6, -1e6],
            [-3e6, -1e6],
            [-4e6, 1e6],
            [-5e6, -1e6],
          ],
        ],
      },
    },
    {
      type: 'Feature',
      geometry: {
        type: 'MultiLineString',
        coordinates: [
          [
            [-1e6, -7.5e5],
            [-1e6, 7.5e5],
          ],
          [
            [1e6, -7.5e5],
            [1e6, 7.5e5],
          ],
          [
            [-7.5e5, -1e6],
            [7.5e5, -1e6],
          ],
          [
            [-7.5e5, 1e6],
            [7.5e5, 1e6],
          ],
        ],
      },
    },
    {
      type: 'Feature',
      geometry: {
        type: 'MultiPolygon',
        coordinates: [
          [
            [
              [-5e6, 6e6],
              [-3e6, 6e6],
              [-3e6, 8e6],
              [-5e6, 8e6],
              [-5e6, 6e6],
            ],
          ],
          [
            [
              [-2e6, 6e6],
              [0, 6e6],
              [0, 8e6],
              [-2e6, 8e6],
              [-2e6, 6e6],
            ],
          ],
          [
            [
              [1e6, 6e6],
              [3e6, 6e6],
              [3e6, 8e6],
              [1e6, 8e6],
              [1e6, 6e6],
            ],
          ],
        ],
      },
    },
    {
      type: 'Feature',
      geometry: {
        type: 'GeometryCollection',
        geometries: [
          {
            type: 'LineString',
            coordinates: [
              [-5e6, -5e6],
              [0, -5e6],
            ],
          },
          {
            type: 'Point',
            coordinates: [4e6, -5e6],
          },
          {
            type: 'Polygon',
            coordinates: [
              [
                [1e6, -6e6],
                [3e6, -6e6],
                [2e6, -4e6],
                [1e6, -6e6],
              ],
            ],
          },
        ],
      },
    },
  ],
};

const vectorSource = new VectorSource({
  features: new GeoJSON().readFeatures(geojsonObject),
});

vectorSource.addFeature(new Feature(new Circle([5e6, 7e6], 1e6)));
const vectorLayer = new VectorLayer({
  source: vectorSource,
  style: styleFunction,
});

let map = null;
export default {
  data() {
    return {};
  },
  mounted() {
    this.initMap();
  },
  methods: {
    initMap() {
      map = new Map({
        layers: [
          new TileLayer({
            source: new OSM(),
          }),
          vectorLayer,
        ],
        target: 'map',
        view: new View({
          center: [0, 0],
          zoom: 6,
          projection: 'EPSG:3857',
        }),
      });
      // const url = 'http://8.136.236.190:30000/geoserver/gwc/service/wmts?REQUEST=GetTile&SERVICE=WMTS&VERSION=1.0.0&LAYER=zhejiang:tb_cereal_2021&STYLE=&TILEMATRIX=EPSG:4326:{z}&TILEMATRIXSET=EPSG:4326&FORMAT=application/vnd.mapbox-vector-tile&TILECOL={x}&TILEROW={y}';

      // var mapExtent = map.getView().calculateExtent(map.getSize());
      // var point = getCenter(mapExtent);
      // debugger;
      // setTimeout(() => {
      //   map.getView().setCenter(point); //设置当前地图的显示中心位置
      // }, 100);
    },
  },
};
</script>

<style></style>
